No because he has the muscle mass to support it , fluid and muscle mass is combination , its like the muscle is a store for fluid the bigger the muscle the more fluid it holds .

Lets say your perfect weight is 140 then anything under say 135 - 138 is going to cause major problems , now going up you can jump a stone before it effects your speed and your cooling to much , you have a lot of leeway going up but very little going down from your sweet spot , and remember most elite fighters are on the low edge with weight because its always been advantages in boxing to be as big as you can be for the weight .

Today its all taken to an artform at elite level , look at how many fighters jump up today and perform great , its because of that stone leeway , how many go down and do great , not many !